—Did you go to the fashion show last week?—I but I was fully occupied the whole week.A. m

问题补充：

—Did you go to the fashion show last week?

—I ，but I was fully occupied the whole week.

A. must go

B. must have gone

C. would go

D. would have gone

答案：

A. must go

B. must have gone

C. would go

D. would have gone

解析：D

解析考查虚拟语气。根据答语中的“but I was fully occupied”可知，此处是对过去事实的虚拟，应用would have done结构，表示“本来要做某事而实际上未做”，故选D项。